Thanks, Tamas,
almost, except I dont want to modify it.
I have a set of constants (defined with DATA)
now I am reading data from an external source and want to put that into RAM,
and then I want to compare that with the constants.

and yes, I did study the datasheet sections 5.3, 5.4, and I have worked with 
the instructions and written some program to read the data from the external 
bus and process it and so on.
I just have a hard time to get from the multi page description to a simple 
code.

>From the discussion here I understand you use instructions like movff,
but how do I name (address) the RAM?
and are the GPRs all 8 bit registers?

thank you
Lembit

----- Original Message ----- 
From: "Tamas Rudnai" <tamas.rudnai@gmail.com>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Tuesday, September 05, 2006 3:06 PM
Subject: Re: [PIC] MPASM - table write problem 18F4520


>I think I have got it: He would like to modify the table declared with 
>DATA.
>
> If that's true, you can't do that. With DATA you create a contant that 
> sits
> in the program memory (Flash ROM), so that you have to move it first into
> the RAM (does not matter if it's static or dynamic, it's the only RAM you
> have inside the PIC). So if you need to modify the text you have to move 
> it
> into a temporary space. If you need it for permanent basis, so that you 
> need
> that modified data after you switch off your device, you have to put it to
> the EEPROM.
>
> Tamas
>
>
>
> On 05/09/06, Jan-Erik Soderholm <jan-erik.soderholm@telia.com> wrote:
>>
>> Lembit Soobik wrote :
>>
>> > I want to read/write the SRAM, not the EEPROM
>> > and not the Flash Memory...
>> >
>> > Lembit
>>
>>
>> Close to *all* instructions can do that.
>> It's not clear what your problem is.
>> Could you be more specific ?
>>
>> Regards,
>> Jan-Erik.
>>
>>
>>
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